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Title: Fisher information universally identifies quantum resources
Authors: Tan, Kok Chuan
Narasimhachar, Varun
Regula, Bartosz
Keywords: Science::Physics
Issue Date: 2021
Source: Tan, K. C., Narasimhachar, V. & Regula, B. (2021). Fisher information universally identifies quantum resources. Physical Review Letters, 127(20), 200402-.
Journal: Physical Review Letters
Abstract: We show that both the classical as well as the quantum definitions of the Fisher information faithfully identify resourceful quantum states in general quantum resource theories, in the sense that they can always distinguish between states with and without a given resource. This shows that all quantum resources confer an advantage in metrology, and establishes the Fisher information as a universal tool to probe the resourcefulness of quantum states. We provide bounds on the extent of this advantage, as well as a simple criterion to test whether different resources are useful for the estimation of unitarily encoded parameters. Finally, we extend the results to show that the Fisher information is also able to identify the dynamical resourcefulness of quantum operations.
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.127.200402
Schools: School of Physical and Mathematical Sciences 
Rights: © 2021 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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